I've discovered that I do a lot better in matches when I take my time. In MW3, I would just rush forward and rack up a lot of kills by constantly being in the enemy's face. But this game it's better if I hang back a little and choose my targets and strategies carefully. I went from a typical score of something like 11 kills 18 deaths to ending matches with scores like 23 kills and 7 deaths. Good times.
Oh, and this is really for the PS3. That option just wasn't available from the drop down menu.